Cactus Game Design Message Boards

The rule for type 2 lists the following that the wording is confusing. Perhaps you can clarify.

A deck may contain no more than: three (3) of any Fortress, Artifact, Covenant, or Curse.

Does this mean 3 of any Fortress, 3 of any Artifact, 3 of any Covenant,3 of any Curse or does it mean 1 Fortress, 1 Artifact and 1 Curse?

For instance you could have 3 Gates of Hell and 3 Captured Arks, but you could not have 4 I am Holies.